[MediaWiki-l] Why does Media wiki claim Questy Captcha is not available?

I am trying to test account creation. From a private browsing windows I navigate to our wiki at https://www.cryptopp.com/wiki/Main_Page. Then I click login and it takes me to https://www.cryptopp.com/w/index.php?title=Special:UserLogin&returnto=Ma...

I get an exception that says:

[XEjuboXCm5007QXukql23QAAAAI] /w/index.php?title=Special:UserLogin&returnto=Main+Page Error from line 18 of /var/www/html/w/extensions/ConfirmEdit/includes/ConfirmEditHooks.php: Class 'QuestyCaptcha' not found

However, when I look in extensions/:

# find . -name '*QuestyCaptcha.*' ./ConfirmEdit/QuestyCaptcha/QuestyCaptcha.php ./ConfirmEdit/QuestyCaptcha/QuestyCaptcha.class.php ./ConfirmEdit/QuestyCaptcha.php

Adding this causes another php exception when attempting to load LocalSettings.php and running update.php (from https://www.mediawiki.org/wiki/Extension:QuestyCaptcha):

wfLoadExtensions([ 'ConfirmEdit', 'ConfirmEdit/QuestyCaptcha' ]);

I'm having trouble getting the latest ConfirmEdit so that does not appear to be a viable option.

Why does Media wiki claim Questy Captcha is not available?

Thanks in advance.